Who is made CYDIA on iOS Device

Purpose and function

Cydia provides a graphical user interface to jailbroken users using Advanced Packaging Tool (APT) repositories to install software unavailable on the App Store. Cydia is based on APT, ported to iOS as part of Freeman's Telesphoreo project.^[5]
Software packages are downloaded directly to an iOS device, to the same location as Apple's pre-installed applications, the /Applications directory. Jailbroken devices can also still buy and download apps normally from the official App Store.^[6]
Cydia can be installed during the process of jailbreaking an iOS device.^[4] Some Jailbreaking tools (each of them supporting a specific set of devices and iOS versions) install Cydia automatically, while others provide a choice to the user.

Software available through Cydia

Some of the packages available through Cydia are standard applications, while some packages are extensions and modifications for the iOS interface and for apps in the iOS ecosystem.^[7][8]
Cydia enables users to find and install open source packages as well as purchase modifications for jailbroken phones. These modifications are based on a framework called MobileSubstrate which makes it relatively easy to install and update said modifications.^[4]
In March 2009, Tuaw announced that Cydia store is open. The announcement summarized an experience posted by a website that Amazon payments was the only option available.^[9]

iOS "signature" feature

Main article: SHSH blob

Cydia caches the digital signatures called SHSH blobs used by Apple to verify restores of iOS (which Apple uses to limit users to only installing the latest version of iOS).^[10] Cydia's storage mechanism enables users to downgrade a device to a prior version of iOS by means of a replay attack.^[11] This means, for example, that a person with a jailbroken device who upgrades to a non-jailbreakable version of iOS can choose to downgrade back to a jailbreakable version.^[12]
iOS 5.0 and later versions of iOS implement an addition to the SHSH system, a random number (a cryptographic nonce) in the "APTicket", making it more difficult to perform a replay attack.^{[13][dubious – discuss]}

History

Freeman first released Cydia in February 2008 as an open-source alternative to Installer.app on iPhone OS 1.1,^[14]
In August 2009, Wired reports that Freeman claimed about 4 million, or 10 percent of the 40 million iPhone and iPod Touch owners to date, have installed Cydia."^[15]
In September 2010, SaurikIT, LLC, announced that it had acquired Rock Your Phone, Inc. (makers of Rock.app). SaurikIT and Rock Your Phone were the two largest providers of third party apps.^[16][17]
On December 15, 2010, SaurikIT filed a dispute with world intellectual property organization against Cykon Technology Limited of Kowloon, Hong Kong over the rights to the domain name "Cydia.com", which was registered by its owner Cykon in 2002. SaurikIT contended that Cykon registered the domain name in bad faith and the domain name incorporates SaurikIT's trademark. SaurikIT initially attempted to purchase the domain, then demanded Cykon to forfeit the domain at cost asserting trademark rights followed by bringing a WIPO proceeding. The complaint was denied by WIPO.^[18][19]
As of April 2011, Cydia had a $10 million in annual revenue and 4.5 million weekly users and according to Freeman $250,000 net annual profit.^[20]
On August 18, 2011,^[21] SaurikIT filed a lawsuit against Hong Kong owner of Cydia.com regarding the same domain name.^[22][23]